import axios from 'axios'
import { MessageBox, Message } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'

// create an axios instance
const service = axios.create({
  // process是Node中的全局变量-->因为vue-cil使用webpack打包，webpack的运行环境是node
  // .env.development：目前代码的环境（开发环境）-->run dev时解析这个文件夹（其中有VUE_APP_BASE_API）
  // .env.production：项目上线的环境（生产环境）-->run build时解析这个文件夹
  // 还有预发布环境，测试环境等
  // baseURL:项目的基准地址
  // process.env:获取当前用户环境变量信息
  // VUE_APP_BASE_API:我们配置的项目根域名
  baseURL: process.env.VUE_APP_BASE_API, // url = base url + request url
  // withCredentials: true, // send cookies when cross-domain requests
  timeout: 5000 // request timeout（请求超时）
})

// request interceptor
service.interceptors.request.use(
  config => {
    return config
  },
  error => {
    console.log(error)
    return Promise.reject(error)
  }
)

// response interceptor
service.interceptors.response.use(
  response => {
    return response
  },
  error => {
    return Promise.reject(error)
  }
)

export default service

// ==================================================================================
// request interceptor
service.interceptors.request.use(
  config => {
    // do something before request is sent

    if (store.getters.token) {
      // let each request carry token
      // ['X-Token'] is a custom headers key
      // please modify it according to the actual situation
      config.headers['X-Token'] = getToken()
    }
    return config
  },
  error => {
    // do something with request error
    console.log(error) // for debug
    return Promise.reject(error)
  }
)

// response interceptor
// 使用axios发起请求，会将返回的数据包装一层
service.interceptors.response.use(
  /**
         * If you want to get http information such as headers or status
         * Please return  response => response
        */

  /**
         * Determine the request status by custom code
         * Here is just an example
         * You can also judge the status by HTTP Status Code
         */
  response => {
    // 使用response.data获取真正数据
    const res = response.data

    // if the custom code is not 20000, it is judged as an error.
    if (res.code !== 20000) {
      Message({
        message: res.message || 'Error',
        type: 'error',
        duration: 5 * 1000
      })

      // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
      if (res.code === 50008 || res.code === 50012 || res.code === 50014) {
        // to re-login
        MessageBox.confirm('You have been logged out, you can cancel to stay on this page, or log in again', 'Confirm logout', {
          confirmButtonText: 'Re-Login',
          cancelButtonText: 'Cancel',
          type: 'warning'
        }).then(() => {
          store.dispatch('user/resetToken').then(() => {
            location.reload()
          })
        })
      }
      return Promise.reject(new Error(res.message || 'Error'))
    } else {
      return res
    }
  },
  error => {
    console.log('err' + error) // for debug
    Message({
      message: error.message,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)
